More than 800 million people around the world may have diabetes, according to new research. But almost 60% of adults aged 30 or over with diabetes might not be getting the treatment they need. Working with the World Health Organization, a global research team estimated that the number of people living with diabetes doubled between 1990 and 2022 — from 7% to 14%. Across the world, rates of diabetes in poorer countries have increased the fastest, according to researchers. The places with the highest rates of diabetes included island nations in the Pacific and the Caribbean, as well as countries in North Africa and the Middle East. In the worst affected nations, more than a quarter of adult men and women were estimated to be living with diabetes. And in some poorer nations, more than 90% of people weren't getting treatment. Diabetes can lead to a number of other serious health problems. The world's largest countries — India and China — had the highest numbers of people with diabetes. In 2022, there were an estimated 212 million people in India and 148 million in China with either type 1 or type 2 diabetes. In the US, 11% of women and 14% of men were living with diabetes in 2022 — for a total of 42 million people. Most people with diabetes have type 2, which can often be prevented by eating healthily and getting exercise. Ranjit Mohan Anjana, who was involved with the research in India, said more ambitious health policies are needed, especially in poorer countries. These include making healthy foods available and affordable for everyone, and giving schoolchildren free, healthy school meals. He added that governments should make sure there are safe places for people to walk and exercise, and give free entry to public parks and fitness centers.